Telephone transmitter



H.L.FALK

TELEPHONE TRANSMITTER June 16, 1925. v 1,542,685

Original Filed Sept. 30, 1921 ATTORNEYS Patented June 16, 192 5.

umg s -Es PATENT OFFICE.

HILBnR'r L; FALK, or NEWoRnEANs, LOUISIANA.

TELEPHONE TRANSMITTER.

Application filed September 30, 1921," Serial No. 504,445. Renewed October 9, 1924.

To (ditch-0722. it may concern .1 v

Be it known that I, Hrnnnn'r L. FALK, a citizen of the United States, residing at New Orleans, parish of Orleans, State of Louisiana, have invented a new and useful Telephone Transmitter, of which the following is a specification. Y

My invention consists of a novel construction of a transmitter, which is especially adapted for long distance or radio telephony, wherein the liability of any of the elements,under high amperage, fusing during lon continued uninterru ted service is Incarrying out my invention, I' employ I a suitable casing for the various elements appertaining to my invention which are assembled therein in such a manner, that any and all of the same are readily accessible forthe purpose of regulating the pressure upon the diaphragm, the silicon granules and their adjuncts, so that perfect regula tion for all requirements can be readily attained. 1 j

To the above ends my invention consists of a novel constructionof outer casing, a diaphragm,and a supporting frame, whereby the cup containing the silicon granules,

the buttons and their adjuncts canbe readi ly supported and. adjusted with respect to said frame and diaphragm.

It further consists of other novel features of construction, all as will be hereinafter fully: set forth and pointed out in the claims. Forthe purpose of illustrating my invention, I have shown in the accompanying drawings, a form thereof which is at present preferred by me, since the same will give in' practice satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists may be variously arranged and organized and that my invention is notlimited to the'precise arrangement and organization of these instrumentalities as herein shown and described.

" Figure I'representsa vertical, sectional view of a transmitter embodying my invention. p

F ig'ure2 represents on an enlarged scale a perspective view in detached position of the supporting frame, whereby the cupcontaining the silicon granules and their adjunctsis supported. I

Figure 3 represents on an enlarged scale in detached position, a sectional View of the cup employed.

Figure 4 represents a'perspective view of the silicon button and its mica platewith the threaded stem projecting therefrom. .Figure 5 represents on an enlarged scale, a sectional View of a preferred form of the diaphragm employed.

1 Similar numerals ofrreference indicate corresponding parts. i

1 designates my novel construction of transmitter, the same comprising the mouth piece 2, which is secured to the body 3, which is composed of the outer annular wall 4 and the inwardly projecting walls or'flanges Sand 6, forming a chamber 7, in which is contained the washer 8 of vul- .canized fibre or the like having the central gasket 13, whichhas the central hole 14 therethrough; Against-the gasket 13 bears the flanges 15 of the frame 16, whose construction will be understood from Figure 2, whlch flanges are engaged by the screws 17.

vThe frame 16 is provided with the Walls 18 and 19, and in said wall 19 is threaded the adjusting screw 20, whose end bears on the rear stem 21, projecting rearwardly from the cup 22, composed of the base 23 and the annular wall 24 as will be understood from Figure 3. The rear stem 21 passes freely through the hole 37 of the -minal of the line 34; passes through said back casing at the point and through the hole 36 ofthe frame 16 and is secured to 1921, Serial #501,860, I have found in practice to give results, superior to any other co' struction, with which I am familiar, and 1 preferably employ the same although of course other diaphragms may be employed without departing from the spirit of my invention.

it will be seen from Figure 1 that a very accurate adjustment of the principal elements of my invention can be attained by the uanipulation of the screw and the nuts 31 and 30, whereby the pressure between the diaphragm 12, the buttons 27 and 2C and the silicon granules 26 can be adjusted with great exactness, and I have found from practical use that the employment of the silicon granules 26 eliminates the possibility of fusing under high amperage, and during long continued service and gives much superior results over carbon grains, which are easily fused by high amperage, especially during longcontinued, uninterrupted service, said carbon grains being also under certain working conditions atl ected by dampness.

If desired the button may also be of silicon, ant galena grains may be employed in lieu of the silicon grains 26, since silicon buttons are harder than carbon, and will not fuse and their polish is not affected by moisture or heat and will stand a much higher polish than the carbon buttons commonly employed, My novel transmitter has been found in practice to be far more sensitive than the carbon type, and by reason of the pressure adjusting devices, permits of perfect regulation for all needs, and is especially adapted for radio telephony, since it is able to withstand any voltage which may be met under commercial requirements.

It will be further apparent that by my construction the outer periphery of the diaphragm 12 is resiliently supported between the soft rubber gaskets 10 and 13, so that the diaphragm particularly when constructed as seen in Figure 5 will be very sensitive and responsive to the sound waves or undulations acting. thereon.

It will now be apparent that I have devised a novel and useful transmitter for telephone for submarine, radio and other purposes, which embodies the features of advantage enumerated as desirable in the statementof the invention and the above description, and while I have in the present in stance, shown and described a preferred embodiment thereof which will give in practice satisfactory and reliable results, it is to be understood that the same is susceptible of modif ation in various particulars withou departing from the spirit or scope of the invention or sacrificing any of its advantages.

Ha ing thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a transmitter, a diaphragm resiliently supported at its outer periphery, a body, of silicon granules supported at the rear of said-diaphragm, means for exerting pressure upon said body of granules, a front silicon button bearing on the front portion of said granules, a threaded stem projecting from said frontbutton through said diaphragm, an adjusting nut on the outer portion of said stem and bearing on said diaphragm, and a nut on'said stem in the rear of said diaphragm.

2.'In a transmitter, a diaphragm resiliently secured at its outer periphery, a cup supported at the rear of said diaphragm, silicon granules in said cup, a button at the bottom of said cup, a silicon button at the outer portion of said cup, a non-conductor attached to the outer silicon button, means at the rear of said transmitter for exerting pressure on said cup and means common to said diaphragm and front silicon button for exerting pressure on the latter.

3. In a transmitter, a diaphragm resilently secured at its outer periphery, acup supported at the rear of said diaphragm and openat its front end, silicon granules in said cup, a button at the bottom of said cup, a silicon button at the outer portions of said cup, a sheet of mica attached to said outer silicon button, a frame for retaining said cup in position, an adjusting screw passing through said frame and adapted to vary the pressure on the rearof said cup, a threaded stem common to the front outer silicon button in said cup and said diaphragm, an adj usting nut on said stem bearing on the front of said diaphragm, and a nut on said stem in the rear of said diaphragm.

4. In a transmitter, a diaphragm resiliently supported at its outer periphery, a cup located at the rear of said diaphragm, silicon granules in said cup, a frame for supporting said cup, the latter having a rear stem passing through said frame, a threaded adjusting screw mounted in said frame and bearing on said stem, a button in the bottom of said cup upon which said granules are supported, a front silicon button in said cup, a sheet of mica supported upon said silicon button, a threaded stem projecting from the latter and passing through said diaphragm, an adjusting nut on the outer portion of said stem and bear- Ill! ingon'said diaphragm and a nut onsaid stem in the rear of said diaphragm.

5. In a transmitter, a body having inwardly projecting flanges, a diaphragm resiliently supported between said flanges, a

granules in said cup, a front button of silicon in said cup, a threaded stem projecting from said front button and passing through said diaphragm and an adjusting nut on said stem and bearing on said'diaphragm, the latter being composed of a cured skin, liquid glass secured to each surface of said skin, and soft iron secured to one of said liquid glass surfaces. V

6. In a transmitter, a diaphragm resiliently supported at its outerv periphery, a cup open at its front end and supported in the rear of said vdiaphragm, silicon granules in said cup, a silicon button in the front of said cup and contacting with said silicon granules, adjusting devices common to said silicon button and said diaphragm, a button in the bottom of said cup, and means for exerting pressure on the rear of said silicon granules. v

7 In a transmitter, a diaphragm resiliently supported at its outer periphery, a cup open at its front and supported at the rear of said diaphragm, a button at the bottom of said cup, a silicon button in the front of said cup, silicon granules supported in said cup between saidbuttons, means for exerting pressure on the rear of said silicon granules, and adjusting devices common to said front silicon button and said diaphragm for adjusting the pressure on the front of said silicon granules.

8. In a transmitter, a diaphragm resiliently supported at its outer periphery,

a cup open at its front and supported at the rear of said diaphragm, a button at the bottom of said cup, a silicon button in the front of said cup, silicon granules supported in said cup between said buttons, means for exerting pressure on the rear of said silicon granules, and adjusting devices common to said front silicon button and said diaphragm for adjusting the pressure on the front of said silicon granules, in combination with a non-conducting plate on the front of said silicon button.

9. In a transmitter, a body 'ofsilicon granules, a support therefor, means in the rear of said body for exerting pressure thereon, diaphragm resiliently supported at its outer periphery at the front of said silicon granules, a silicon button contacting with the front of said body of silicon granules, and adjusting devices common to said silicon button and said diaphragm for adjusting the pressure upon the front of said silicon granules.

10. In a transmitter, a body of silicon granules, a support therefor, a front silicon button contacting with the front of said granules, a rear button contacting with the rear of said granules, a pressure exerting device located at the rear of said silicon granules for com ressing the latter from the rear, insulation or the front of said silicon button, a diaphragm in front of said silicon button and resiliently supported at its outer edges, and adjusting devices common to said silicon button and diaphragm.

11. In a transmitter, a body of silicon granules, a support therefor, a front silicon button contacting with the front of said granules, a rear button contacting with the rear of said granules, a pressure exerting device located at the rear of said silicon granules for compressing the latter from the rear, insulation for the front of said silicon button, a diaphragm in front of said silicon button and resiliently supported at its outer edges, and adjusting devices common to said silicon button and diaphragm, the latter being composed of a cured skin having liquid glass on each side thereof and a soft iron sheet secured to one of said liquid glass surfaces. v e

12. In a transmitter, a body composed of a v granular variable resistance element, means for supporting the latter, means in the rear of said body for exerting pressure thereon, a front silicon button contacting with the front of said body, a diaphragm, and adjusting devices common to said silicon button and said diaphragm.

HILBERT L. FALK.

\Vitnesses:

E. HAYWARD FAIRBANKS, C. D. MoVAY. 

